Valve assembly for control of a power cylinder or hydraulic motor has control cylinder has constant control oil flow independent of working pressure level in main pressure source

摘要

The valve assembly for control of a power cylinder or hydraulic motor has a mechanically operated hydraulic directional valve (4) on which is mounted a piloting unit (5). The control cylinder (11) has a constant control oil flow independent of the working pressure level in the main pressure source (P). The magnitude of the inflowing, constant control oil flow is limited to a value required in the control oil flow to achieve the necessary response time of the piloted direction valve slide.